REGRESSION (298981@main): fetch() throws TypeError when using targetAddressSpace: 'loopback' with localhost requests

rniwa · rniwa · commit 295fd224c10d · 2025-12-16T23:01:27.000-08:00
https://bugs.webkit.org/show_bug.cgi?id=304164 rdar://166574523 Reviewed by Alex Christensen. Hide the dictionary entry behind a runtime check since this feature (IPAddressSpace) shouldn't be enabled anywhere. Test: http/wpt/fetch/fetch-loopback.html * LayoutTests/http/wpt/fetch/fetch-loopback-expected.txt: Added. * LayoutTests/http/wpt/fetch/fetch-loopback.html: Added. * Source/WebCore/Modules/fetch/FetchRequestInit.idl: Canonical link: https://commits.webkit.org/304577@main
diff --git a/LayoutTests/http/wpt/fetch/fetch-loopback-expected.txt b/LayoutTests/http/wpt/fetch/fetch-loopback-expected.txt
@@ -0,0 +1,3 @@
+
+PASS fetch with targetAddressSpace set to "loopback" should succeed
+
diff --git a/LayoutTests/http/wpt/fetch/fetch-loopback.html b/LayoutTests/http/wpt/fetch/fetch-loopback.html
@@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<html>
+<body>
+<script src=/resources/testharness.js></script>
+<script src=/resources/testharnessreport.js></script>
+<script>
+
+promise_test((t) => {
+    return fetch(location.origin + '/resources/gc.js', {
+        targetAddressSpace: 'loopback'
+    });
+}, 'fetch with targetAddressSpace set to "loopback" should succeed');
+
+</script>
+</body>
+</html>
diff --git a/Source/WebCore/Modules/fetch/FetchRequestInit.idl b/Source/WebCore/Modules/fetch/FetchRequestInit.idl
@@ -43,5 +43,5 @@ dictionary FetchRequestInit {
     any signal;
     RequestPriority priority;
     any window; // can only be set to null
-    IPAddressSpace targetAddressSpace;
+    [EnabledBySetting=LocalNetworkAccessEnabled] IPAddressSpace targetAddressSpace;
 };

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,3 @@`
	`1`	`+`
	`2`	`+PASS fetch with targetAddressSpace set to "loopback" should succeed`
	`3`	`+`